If you want to run nested commands on the results of a ‘find’, then you’ll have to stop bash expansion running before the find command.
E.g. This won’t work because the shell expansion will happen before the find has set the {} to the filename:
find . -type f -name "*.html.bak6" -exec mv {} `basename "{}" .bak6` \;
This will work because the shell expansion will happen after {} is populated:
find . -type f -name "*.html.bak6" -exec sh -c 'mv {} `basename "{}" .bak6`' \;
